Granted Patent
Utility
US 5,820,752 · App. 08/513,430
Methods and apparatus for recycling used antifreeze/coolant
Inventors:
Norman D. Berke, Stephen M. Woodward, Aleksei V. Gershun, Peter M. Woyciesjes, Robert J. Rosvally
Patented Case
View Patent ↗
Granted: Oct 13, 1998
Filed: Aug 10, 1995
Inventors
Norman D. Berke
Stephen M. Woodward
Aleksei V. Gershun
Peter M. Woyciesjes
Robert J. Rosvally
Assignee (at issue)
Prestone Products LLC
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.